[css-flexbox-1-tests] [css-flexbox] Add tests for intrinsic sizing behavior (#5791)

Taking over https://github.com/w3c/web-platform-tests/pull/5281 and fixing the issue pointed out by dholbert

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5791

Received on Thursday, 4 May 2017 21:13:31 UTC